From 4717fe3d8dec42bc951a44f41efc95d635d26325 Mon Sep 17 00:00:00 2001 From: Rajneesh Bhardwaj Date: Fri, 19 Nov 2021 10:23:05 -0500 Subject: [PATCH] drm/amdkfd: CRIU checkpoint and restore xnack mode Recoverable page faults are represented by the xnack mode setting inside a kfd process and are used to represent the device page faults. For CR, we don't consider negative values which are typically used for querying the current xnack mode without modifying it. Reviewed-by: Felix Kuehling Signed-off-by: Rajneesh Bhardwaj Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 15 +++++++++++++++ drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 + 2 files changed, 16 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c index ab5107a3fe36b..3ec44f71307df 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -1848,6 +1848,11 @@ static int criu_checkpoint_process(struct kfd_process *p, memset(&process_priv, 0, sizeof(process_priv)); process_priv.version = KFD_CRIU_PRIV_VERSION; + /* For CR, we don't consider negative xnack mode which is used for + * querying without changing it, here 0 simply means disabled and 1 + * means enabled so retry for finding a valid PTE. + */ + process_priv.xnack_mode = p->xnack_enabled ? 1 : 0; ret = copy_to_user(user_priv_data + *priv_offset, &process_priv, sizeof(process_priv)); @@ -2241,6 +2246,16 @@ static int criu_restore_process(struct kfd_process *p, return -EINVAL; } + pr_debug("Setting XNACK mode\n"); + if (process_priv.xnack_mode && !kfd_process_xnack_mode(p, true)) { + pr_err("xnack mode cannot be set\n"); + ret = -EPERM; + goto exit; + } else { + pr_debug("set xnack mode: %d\n", process_priv.xnack_mode); + p->xnack_enabled = process_priv.xnack_mode; + } + exit: return ret; } diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index df68c4274bd93..903ad4a263f09 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -1056,6 +1056,7 @@ void kfd_process_set_trap_handler(struct qcm_process_device *qpd, struct kfd_criu_process_priv_data { uint32_t version; + uint32_t xnack_mode; }; struct kfd_criu_device_priv_data { -- 2.30.2